Abstract
The development of the morphology in asymmetric Polystyrene-b-Polylactide (PS-b-PLA) thin films was investigated by Tapping-mode AFM. The thin films were prepared by solution casting with different evaporation rates. Films were cast onto hydrophobic Si wafers. When PS-b-PLA was dissolved in chloroform, fast evaporation (~110nL/s) produced hexagonally packed perpendicular PLA cylinders in the PS matrix; intermediate evaporation (~25nL/s) generated mixed microstructures of PLA cylinders of either vertical or parallel to the substrate; slow evaporation (~9nL/s) produced the PLA cylinders that were fully parallel to the substrate. This simple one step route is shown where highly oriented, ordered arrays of cylindrical domains of PS-b-PLA can be produced over large distance.
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